To retrieve the product attribute set name, I just create this function on the product class
public function getAttributeSetName()
{
$attributeSetModel = Mage::getModel("eav/entity_attribute_set");
$attributeSetModel->load($this->getAttributeSetId());
return $attributeSetModel->getAttributeSetName();
}
This is how to assign an existing attribute to an existing attribute set
$setup = new Mage_Catalog_Model_Resource_Eav_Mysql4_Setup('core_setup');
$setup->startSetup();
$attribute_set_name = ATTRIBUTE_SET_VISIT;
$attribute_code = $attr;
$group_name = GROUP_ADIN;
$attribute_set_id=$setup->getAttributeSetId('catalog_product', $attribute_set_name);
$attribute_group_id=$setup->getAttributeGroupId('catalog_product', $attribute_set_id, $group_name);
$attribute_id=$setup->getAttributeId('catalog_product', $attribute_code);
$setup->addAttributeToSet($entityTypeId='catalog_product',$attribute_set_id, $attribute_group_id, $attribute_id);
Here how to retrieve attribute set by name instead of id
$name = "Default"
$attribute_set = Mage::getModel("eav/entity_attribute_set")->getCollection();
$set = $attribute_set->addFieldToFilter("attribute_set_name", $name)->getFirstItem();
echo "id: ".$set->getAttributeSetId();